
/**
    图片适配
    现在手机大部分@2倍图起
    js获取dpr
    var dpr = window.devicePixelRatio || 1
*/
@mixin bg-image($url) {
    background-image: url($url + "@1x.png");
    @media (-webkit-min-device-pixel-ratio: 2),(min-device-pixel-ratio: 2) {
        background-image: url($url + "@2x.png");
    }
    @media (-webkit-min-device-pixel-ratio: 3),(min-device-pixel-ratio: 3) {
        background-image: url($url + "@3x.png");
    }
}
